/ Dictionary / Index N neutrosphere: Meaning and Definition of Find definitions for: neu•tro•sphere Pronunciation: (n'tru-sfēr", ny'-), [key] — n. the part of the atmosphere whose constituents are, for the most part, electrically neutral, extending from the earth's surface to the base of the ionosphere. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. neutrophil Nev. Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language